Sentencing Harrison, the judge said: "This is serious offending, not least because class A drugs, particularly, destroy people's lives and you were making a commercial business out of destroying people's lives.
Lee Harrison, 27, was sentenced at Liverpool Crown Court on Friday after his trial heard he had been jointly in control of a line supplying crack cocaine and heroin in October and November last year.
Ms Menary said a Nokia mobile phone found in the car was used for a drugs line which had sold class A drugs on at least 247 occasions during October and November.
Stephen McNally, defending Harrison, said: "This offending came on the back of a difficult period in his life for reasons which he does not wish me to ventilate in open court, which I stress he does not claim excuse any of his offending.
Officers searched Harrison's address on Liverpool Road, Huyton, which he shared with his mother Sharon, and found cocaine with a value of up to £11,900 as well as adulterant for cocaine, scales and small plastic bags.
